a77/components/my/download.vue

<template>
  <view>
	  <!-- #ifdef H5 -->
     	  <view class="down" @click="onDown">App下载</view>
	  <!-- #endif -->
  </view>
</template>

<script>
	export default{
		methods:{
			onDown(){
				uni.showToast({
				   title:"开发中",
				   icon:"none"
				})
			}
		}
	}
</script>

<style>
	.down{
		position: fixed;
		left: 50%;
		bottom: 15%;
		width: 200rpx;
		height: 80rpx;
		line-height: 80rpx;
		border-radius: 40rpx;
		text-align: center;
		z-index: 666;
		background-color: #000000;
		color: #fff;
		transform: translate(-50%,-15%);
		font-size: 34rpx;
	}
</style>